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A comment on Natural Earth: A public domain map dataset.

Re:Natural Earth: A public domain map dataset by heydenberk on Monday July 07, 2014 @05:22PM (#8001506)
Earlier this week I wanted to write a function that takes geographic coordinates and returns whether that coordinate is on land or in water. I might be able to use the raster data here to do that.
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Re:Natural Earth: A public domain map dataset by bdon on Monday July 07, 2014 @05:35PM (#8001594)
Depending on the resolution you need, the OpenStreetMap derived world coastline may work better:

http://openstreetmapdata.com/data/land-polygons

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Re:Natural Earth: A public domain map dataset by gissolved on Tuesday July 08, 2014 @06:39AM (#8003847)
You could also use the World Vector Shorelines (http://shoreline.noaa.gov/data/datasheets/wvs.html) or if you need lakes, the GSHHG (http://www.ngdc.noaa.gov/mgg/shorelines/gshhs.html) from NOAA.

I recently implemented similar functionality in Python, I haven't open sourced it (yet) but I can share some code if you want.

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